The 2018 BMW M6 is a high-performance grand tourer that demands precision maintenance. Under the hood lies the potent 4.4L twin-turbocharged V8 engine (engine code S63B44B G), a powertrain designed to deliver exhilarating speed while maintaining daily drivability. To keep this machine performing at its peak, it is critical to use lubricants specifically formulated for its unique requirements. Standard off-the-shelf fluids often cannot withstand the extreme thermal loads and stress placed on the engine and transmission by the M6’s aggressive tuning.
Proper lubrication extends the service life of every component in this complex vehicle. The S63 engine operates at high temperatures and pressures, requiring an oil that resists oxidation and thermal breakdown. Similarly, the automatic transmission and limited-slip differential in the M6 require fluids that provide exact friction characteristics to ensure smooth power delivery and prevent premature wear. By utilizing high-performance synthetic fluids, owners can protect their investment against the common issues that affect high-mileage performance vehicles, such as sludge buildup, fluid degradation, and seal hardening.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – Designed specifically for the precise demands of European engines, this oil provides superior protection for the turbocharged S63 powerplant.
- WIX Oil Filter – A premium filtration solution that offers improvements over standard OEM filters to ensure clean oil circulation.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides exceptional protection for the M6’s automatic transmission under severe driving conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – An OE specification fluid that guards against wear, sludge, and promotes smooth, shudder-free shifts.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formulation that requires mixing, offering protection up to 150,000 miles or 5 years for passenger cars.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Advanced protection for the limited-slip differential, helping to reduce operating temperatures and prevent rust.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Formulated for quiet operation and designed to help seals remain soft to prevent leaks.
Engine Oil and Filtration Specifications
The heart of the 2018 BMW M6 is the S63B44B G engine, a twin-turbocharged V8 that generates significant power and heat. The manufacturer recommends a viscosity of either 0W-30 or 5W-30 for all temperature conditions. For an optimal change, the engine requires approximately 10 quarts of oil when including a filter replacement. It is crucial to use a fluid that meets the stringent requirements of European high-performance engines. AMSOIL 0W-30 MS 100% Synthetic European Motor Oil is engineered with a unique blend of synthetic base oils and premium additives to handle these specific demands.
This European formula is designed to withstand the extreme thermal stress of the turbochargers while providing excellent engine cleanliness. During an oil change, the drain plug should be torqued to 18 ft/lbs, and the seal should always be replaced to prevent leaks. The AMSOIL MS oil is also effective at controlling oil consumption, a common concern in high-mileage performance engines, and offers superior viscosity control to ensure consistent protection during cold starts and hot highway runs.
Filtration is just as critical as the oil itself. The WIX Oil Filter (Code 57189-EA) is recommended for this vehicle. It features premium media that offers improvements over original equipment manufacturer (OEM)-branded filters. The filter is capable of trapping contaminants effectively, extending the life of the synthetic oil and protecting the engine’s intricate oil galleries from abrasive particles.
Transmission and Drivetrain Protection
The 2018 BMW M6 utilizes an automatic transmission that requires a fluid capable of withstanding heavy use, elevated temperatures, and challenging terrain. AMSOIL offers two distinct options for this vehicle. The Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid (ATF) is ideal for those seeking maximum performance. It remains fluid in sub-zero temperatures and provides reserve protection during heavy use and abuse. This fluid is particularly beneficial for owners who push their vehicle hard, as it resists thermal breakdown better than standard fluids.
For those preferring a fluid that closely mimics original equipment specifications, the OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is an excellent choice. It guards against leaks and promotes smooth, shudder-free shifts, ensuring the transmission operates quietly and efficiently. While the source documentation does not specify a total fluid capacity for the transmission, using the correct fluid is essential to protect the gears and clutches from wear and sludge buildup.
The differential is another critical component that benefits from high-performance lubrication. The M6 features a rear limited-slip differential (220M Rear) that requires 2.1 pints of gear lube. AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is specifically recommended for this application. This lube contains friction modifiers designed for limited-slip applications, helping to prevent the chattering and noise often associated with these differentials. It also provides advanced protection against wear, rust, and corrosion, while helping to control thermal runaway in the rear end.
Cooling, Braking, and Steering Systems
Maintaining the cooling system is vital for the longevity of the twin-turbo engine. The 2018 BMW M6 has a coolant capacity of 19.5 quarts. Owners have the option of using AMSOIL Passenger Car & Light Truck Antifreeze & Coolant, which is a 50/50 pre-mix of ethylene glycol, or the concentrated Propylene Glycol Antifreeze. The propylene glycol option is highly effective, offering protection up to 150,000 miles or 5 years in passenger cars. Both formulations are phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making them compatible with all other antifreeze colors and safe for all cooling system metals, gaskets, and hoses.
Braking performance must never be compromised. The M6 requires a DOT 4 fluid to meet BMW’s specifications. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures excellent responsiveness from the ABS and traction control systems. Its stable viscosity allows for consistent pedal feel regardless of the operating temperature, which is crucial for a vehicle of this caliber.
For the power steering system, AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is recommended. This fluid helps reduce friction and keeps seals soft, preventing the leaks that can plague aging systems. It offers strong anti-wear protection and performs well in both high and low temperatures, ensuring quiet and smooth steering operation.
Additional Maintenance and Seasonal Care
To keep the fuel system clean and efficient, AMSOIL P.i.® Performance Improver Gasoline Additive is a valuable addition. This additive helps restore up to 14% horsepower by cleaning GDI fuel injectors to 100% flow rate after just one tank of treated fuel. It also improves fuel economy and reduces the need for higher-octane fuel, while helping to prevent carbon buildup and pre-ignition knock.
During seasonal storage, protecting the vehicle is just as important as driving it. AMSOIL Gasoline Stabilizer can be added to the fuel tank to keep the gasoline fresh for up to 12 months, preventing varnish and gum buildup. For long-term storage of the engine, AMSOIL Engine Fogging Oil is highly effective at preventing internal rust and corrosion. This is an ideal preventative measure for any vehicle that may sit idle for extended periods.
Vehicle Background and History
The 2018 BMW M6 represents the culmination of BMW’s high-performance engineering traditions. Based on the F12/F13 generation of the 6 Series, the M6 coupe and convertible models are renowned for their ability to blend track-focused ferocity with grand touring comfort. The vehicle is powered by the 4.4-liter S63 V8 engine, which is a twin-turbocharged powerhouse derived from the engine found in the M5 and X5 M. This engine code, S63B44B G, indicates a specific iteration of the powerplant designed for the M6, featuring advanced direct injection and precise valve control.
Owners of the 2018 M6 often cite its dual nature as its greatest asset. It is a machine that can be driven quietly and comfortably in daily traffic, yet transforms into a blistering performance car at the touch of the accelerator. The S63 engine typically produces around 560 horsepower, delivering power to the rear wheels via a rapid-shifting automatic transmission. The chassis is stiffer and more responsive than the standard 6 Series, equipped with adaptive suspension and a limited-slip differential to manage the immense torque available.
While the M6 is a mechanical marvel, like any high-performance European vehicle, it has specific maintenance needs that distinguish it from standard cars. The high-output engine and complex electronic systems require fluids that can cope with thermal extremes. One common issue for owners of this generation of M vehicles is oil consumption, particularly as the vehicle ages. The S63 engine can be prone to consuming oil faster than expected due to the high operating temperatures and the nature of the turbochargers. Using a high-quality synthetic oil like AMSOIL 0W-30 MS, which is engineered to resist breakdown and control consumption, can help mitigate this issue and extend the time between fill-ups.
Another potential problem area for the M6 is the cooling system. The complexity of the cooling passages and the high thermal load on the engine mean that coolant degradation can lead to overheating or corrosion issues over time. The use of a robust, long-life antifreeze like the AMSOIL formulations can help prevent these failures and ensure the engine stays within optimal temperature ranges. Additionally, the limited-slip differential in the M6 is a known wear item. Owners who enjoy spirited driving may experience “shudder” or noise from the rear diff if the fluid degrades. Regular replacement with a limited-slip specific gear lube like AMSOIL SEVERE GEAR can maintain the smooth operation and protect the clutch packs inside the differential.
Finally, the electronic and hydraulic systems in the M6, including the power steering and braking systems, rely on fluid integrity. Over time, brake fluid absorbs moisture, which can lower its boiling point and affect pedal feel. Similarly, power steering seals can harden and leak. Switching to synthetic brake fluid and power steering fluid helps maintain the hydraulic performance and keeps seals pliable, preventing costly leaks and ensuring the safety systems function as intended. By addressing these specific vulnerabilities with the right products, owners can preserve the driving dynamics and reliability that make the 2018 BMW M6 such a beloved vehicle.
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